Heat treatment review jingle
--Mesh belt continuous furnace - quenching, tempering articles
1
Regional division
Heated hot zone
Different products are stored
2
Empty box inspection
Product switching every day
No residue at the bottom of the empty box
3
Loading weighing
Loading the wire must be weighed
Evenly flattened
4
Tempering delay
Quenching and tempering have intervals
If it is not continuous, how?
Interval time is set
Tempering delay is eliminated
5
Test items
Surface hardness
Metallographic organization daily çž…
Eddy current testing recommended investment
Hard cracks are all driven away
6
Sink concentration
Sink concentration is risky
Refractometer to check daily
Especially dephosphorization is the focus
Separate slots are recommended
7
Temperature control
Working thermocouples in various districts
Sink oil tank can not leak
Temperature fluctuations
±10°C heating zone
±5 °C tempering zone
Check the temperature big data
Field verification alarm
Cheap metal type is the mainstream
Regular replacement must have
Replace after heating for 1 year
Tempering for 2 years to be decisive
8
SAT (system accuracy test)
SAT air/load
Detection can be compared
Comparison of doubles in the same area
Once a month, I have to
If the detection method is used
Punch every quarter
9
TUS (furnace temperature uniformity test)
TUS plane method
According to the size difference of the furnace
Number of galvanic changes
If you ask how long to test
See you every year or after major repairs
10
Carbon potential control
Carbon potential oxygen probe
Data fluctuations are required
±0.05 upstream and downstream
Check the alarm function enough
Daily verification can't leak
Fixed carbon foil weighing method
Three-gas analysis direct measurement
The two methods are basically unbiased
Flow curing is not chaotic
Burning carbon in the furnace
Combined with protective gas nitrogen
Stable atmosphere effect
11
Oil tank control
Oil level and agitation
Alarm device continues to look
12
Oil detection
Oil performance is critical
Half year testing is to be achieved
13
Instrument verification
Temperature control carbon control and other instruments
Regular verification is not tricky
Remarks section:
*heat treatment
Heat treatment refers to a metal thermal processing process in which the material is heated, held, and cooled in the solid state to obtain the desired structure and properties. --Excerpt from Baidu
5, eddy current testing:
Principle: In an eddy current probe, an alternating current flows through the coil and produces an oscillating magnetic field. If the probe and its magnetic field are close to the conductive material of the metal test piece, the circular electron flow called eddy current will begin to move through the metal like the rotating water in the fluid. The eddy current flowing through the metal will in turn generate its own magnetic field, interacting with the coil and its field through mutual inductance. Defects such as large fluctuations in metal hardness or surface cracks will affect the impedance of the coil, interrupting or changing the amplitude and mode of the eddy current and the magnetic field it produces.
8, SAT (system accuracy test):
Comparison method: Compare uncontrolled readings of control and resident thermocouples (can be the same as control thermocouples or over-temperature thermocouples).
Detection method A:
Compare uncorrected temperature control system readings (control thermocouples, leads, control instruments) with corrected test temperature system readings (test thermocouples and test instruments).
Detection method B:
Compare uncorrected control thermocouple readings with corrected test temperature system readings (test thermocouples and test instruments).
9, TUS (furnace temperature uniformity test):
The uniform temperature characteristics, effective working area and operating temperature range of the furnace can be determined.
Temperature uniformity allows for maximum error: ±15 ° C for quenching furnaces and ± 10 ° C for tempering furnaces.
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